This Model 64 shot seven out of eight different loads approximately 3 1/2" high at 25 yards. I used JB Weld to build up the front sight and then filed down the sight a little at a time based on POA/POI testing. I finally achieved 25 yard POA=POI with the sight filed down to the height in the above picture. The final height was approximately 1/2mm higher than I had calculated it would be using the sighting radius, impact adjustment and shooting distance formula.
This is a picture of some welded stainless steel replacing the JB Weld.
This is a picture of the finished sight
Mark